Ab initio study on the electromechanical response of Janus transition metal dihalide nanotubes

Arpit Bhardwaj and Phanish Suryanarayana ()
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Arpit Bhardwaj: Georgia Institute of Technology
Phanish Suryanarayana: Georgia Institute of Technology

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 3, 1-8

Abstract: Abstract We study the electronic response of Janus transition metal dihalide (TMH) nanotubes to mechanical deformations using Kohn–Sham density functional theory. Specifically, considering twelve armchair and zigzag Janus TMH nanotubes that are expected to be stable from the phonon analysis of flat monolayer counterparts, we first compute their equilibrium diameters and then determine the variation in bandgap and effective mass of charge carriers with the application of tensile and torsional deformations. We find that the nanotubes undergo a linear and quadratic decrease in bandgap with tensile and shear strain, respectively. In addition, there is a continual increase and decrease in the effective mass of electrons and holes, respectively. We show that for a given strain, the change in bandgap for the armchair nanotubes can be correlated with the transition metal’s in-plane d orbital’s contribution to the projected density of states at the bottom of the conduction band. Graphic abstract

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00507-0

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